Only enable libbpf debug log if --debug is passed #216
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Logger callbacks were added by libbpfgo: aquasecurity/libbpfgo#284. This triggered debug output from
libbpfonebpf_exporter's startup, which is not desirable. This PR makes debug logs only appear if debug is enabled.We also pass
libbpflogs throughlogpackage to add timestamps and write tostderrto match the rest of the logs.